It was designed for college kids. But it took legions of people their parents' age to fulfill its ultimate destiny

Facebook is five. Maybe you didn't get it in your news feed, but it was in February 2004 that Harvard student Mark Zuckerberg, along with some classmates, launched the social network that ate the world. Did he realize back then in his dorm that he was witnessing merely the larval stage of his creation? For what began with college students has found its fullest, richest expression with us, the middle-aged. Here are 10 reasons Facebook is for old fogies:

1. Facebook is about finding people you've lost track of. And, son, we've lost track of more people than you've...